Locked in to 40/20 and it seems no way out
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- Re: Locked in to 40/20 and it seems no way out
Locked in to 40/20 and it seems no way out
04-12-2014 6:46 PM
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BUT my profile would appear to be locked on 40/20 following one of the resets done by an Openreach engineer. My profile should be 80/20. I know I cannot get 80/20 because of my distance from the cabinet. My 'clean' tags are Download: 38.1 Mbps - 55.8 Mbps / Upload: 8.9 Mbps - 14.5 Mbps. My Modem indicates that 51206 kbps down is achievable with 13424 kbps up. My actual up speed is 13231, very close to the achievable and to the best 'clean' speed. My down speed is 39994, not a penny more, not a penny less. By my calculations applying the same percentage achieved up, my down speed should be around 50470. A request to Plusnet to reprofile me back to 80/20 was met with, 'just be happy with what you've got'. If my connection is capable of more and I am paying for it, I would like whatever little speed increase I can get. How do I get the block removed, any suggestions?
Trevor
Re: Locked in to 40/20 and it seems no way out
04-12-2014 9:06 PM
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and what does https://portal.plus.net/my.html?action=data_transfer_speed say ?
Re: Locked in to 40/20 and it seems no way out
04-12-2014 10:47 PM
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It's possible you've been put on to a banded profile by the DLM, which I think Plusnet can check for you.
If your connection has been solid the DLM should undo it's restrictions over time, but as for how much time nobody really seems to have a solid answer for that.
Re: Locked in to 40/20 and it seems no way out
05-12-2014 9:31 AM
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Re: Locked in to 40/20 and it seems no way out
05-12-2014 9:54 AM
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jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Locked in to 40/20 and it seems no way out
05-12-2014 9:58 AM
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I think your comment about this being the highest he might see is a little suspect!
jelv (a.k.a Spoon Whittler) Why I have left Plusnet (warning: long post!) Broadband: Andrews & Arnold Home::1 (FTTC 80/20) Line rental: Pulse 8 Home Line Rental (£14.40/month) Mobile: iD mobile (£4/month) |
Re: Locked in to 40/20 and it seems no way out
05-12-2014 10:07 AM
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Re: Locked in to 40/20 and it seems no way out
05-12-2014 12:00 PM
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Also remember that when DLM has intervened and put FEC+Interleaving onto a line, the Openreach Huawei modem starts to report excessively high "attainable" speeds; once DLM de-intervenes, the actual speed improvement only tends to be about half of the suggested improvement. We have no idea whether the Billion makes the same error of judgement.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Locked in to 40/20 and it seems no way out
05-12-2014 12:57 PM
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Re: Locked in to 40/20 and it seems no way out
05-12-2014 1:18 PM
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1. The SNRM value isn't very much above 6dB.
If DLM removed the banding alone, that would allow the modems to target the standard 6dB, and you'd probably only gain around 1Mbps max.
2. DLM has indeed turned on FEC and interleaving (INP>0 and delay>0).
This is currently using (R=10) bytes out of every (N=42) bytes as self-correction overhead, or about 24%. Fairly high.
It looks very much like you'd need DLM to remove this before you'd get the bulk of your speed improvement. The likelihood of this depends on some further statistics that you don't show - the number of ES's over a 24 hour period.
3. DLM has set INP to 3.5
DLM has been seen, so far, to set values of 3.0 and 4.0, but not 3.5. I have only seen this once before, by someone reporting that they were told (by an Openreach engineer) that their cabinet is trialling vectoring.
Perhaps that is the case here. Or perhaps DLM is using new settings that haven't been seen much.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Locked in to 40/20 and it seems no way out
05-12-2014 1:44 PM
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OH Frame Errors 0 4
RS Words 281130417 3924030
RS Correctable Errors 6128 35
RS Uncorrectable Errors 0 0
HEC Errors 0 0
OCD Errors 0 0
LCD Errors 0 0
Total Cells 138208575 0
Data Cells 34218 0
Bit Errors 0 0
Total ES 0 3
Total SES 0 0
Total UAS 28
Any help? This is the bit I couldn't pdf.
Trevor
Re: Locked in to 40/20 and it seems no way out
05-12-2014 5:40 PM
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Essentially, you want to watch the "Total ES" value (first column should be the downstream value).
If this value accumulates over (I believe) 2,800 in a 24 hour period, then DLM will usually choose to intervene (or intervene further). To de-intervene, or reduce intervention, the ES value has to accumulate less than 288 over a 24-hour period ... and probably has to do this for a good period - days or even months.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Locked in to 40/20 and it seems no way out
06-12-2014 5:58 PM
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Over the following 29 hours my ES figures are down - 22, up - 201.
This seems to fit with the lower parameters for a lesser intervention by the DLM.
BTW it seems the Billion can adjust the SNR either manually or automatically.
Trevor
Re: Locked in to 40/20 and it seems no way out
07-12-2014 12:03 PM
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Upstream, I should have mentioned, has had no DLM intervention (INP=0, delay=0), but the modems have negotiated some amount of FEC protection (R=16) anyway, but without interleaving (D=1); this seems to be a fairly common occurrence on the upstream. It means you are using (R=16) bytes out of every (N=255) bytes for the self-correction data, so around 6% of your upstream bandwidth is being used up this way.
The modem might let you adjust the SNR, but does the DSLAM pay any attention during a sync? It might not do. In any case, there is probably more to be gained from getting DLM to de-intervene than would be gained from adjusting the target SNR down; in fact, setting a higher target SNR in order to foster better error figures, in order to persuade DLM to leave you alone, might give you the best speed overall.
Otherwise, how is the 8800AXL? Does it give more statistics data than you've shown (such as 15 minute and 24 hour counters)? Either via the GUI or via telnet?
If there were any available 6 weeks ago, I'd have probably bought one for the ability to use a 4G modem. As none were available, I re-flashed my existing router with something open-source that let me do the same. But I'd really want access to the full statistics.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Re: Locked in to 40/20 and it seems no way out
07-12-2014 3:59 PM
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i was under the impression that DLM in fibre cabinet was no longer active (until the came up with an alternate system).?
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